1[Metal Material] RC diff outdrive with driveshaft cup kit, made of premium steel material, durable, use more powerful, better control your RC car. 2[Reduced Friction] RC diff drive cup minimizes space and friction for more stable CVD rotation to the highest level. Suitable for ARRMA 1/7 1/8 series RC cars. 3[Precise Size] These RC car differential drive cups and driveshaft joint cups are accurately sized for greater durability, the transmission is more stable and powerful. 4[Improved Driving Power] Metal RC diff outdrive brings more efficient power transmission system, provides stable driving and improves the driving power of RC cars. 5[Easy To Install] RC differential drive cups are easy to install and remove, so you can directly replace the damaged parts and get higher strength, with screw fixing, not easy to loosen.